Sources identified the detective as Daniel Nicholson, who has been a member of the department for 17 years, 11 News I-Team lead investigative reporter Jayne Miller said.

Miller reported that Nicholson allegedly used his police powers to raid homes in the Northeast District of Baltimore searching for his daughter, even though the case was being investigated by Baltimore County police.

Internal investigators became aware of the detective's actions when people targeted in the raids complained about how they were treated, Miller reported.

Baltimore Police Commissioner Fred Bealefeld would not comment on the investigation Tuesday afternoon. A police representative said the department is taking the complaints very seriously.

11 News has also learned that the missing girl has since been found.

Nicholson is the lead investigator in the high-profile Phylicia Barnes case. Barnes was 16 when she disappeared while visiting Baltimore in December 2010. Her body was founded last year in the Susquehanna River.

Police are still searching for the killer in that case.

Stay with WBALTV.com and WBAL-TV 11 News for more details as they become available.